256251 has 8 divisors (see below), whose sum is σ = 344080. Its totient is φ = 169632.

The previous prime is 256219. The next prime is 256279. The reversal of 256251 is 152652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256251 - 2⁵ = 256219 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256251.

It is not an unprimeable number, because it can be changed into a prime (256211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 501 + ... + 873.

It is an arithmetic number, because the mean of its divisors is an integer number (43010).

2²⁵⁶²⁵¹ is an apocalyptic number.

256251 is a deficient number, since it is larger than the sum of its proper divisors (87829).

256251 is a wasteful number, since it uses less digits than its factorization.

256251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605.

The product of its digits is 600, while the sum is 21.

The square root of 256251 is about 506.2124060115. The cubic root of 256251 is about 63.5167872619.

The spelling of 256251 in words is "two hundred fifty-six thousand, two hundred fifty-one".